5.94 For a certain section of a pine forest, the number of diseased trees per acre Y has a Poisson distribution with mean   10. The diseased trees are sprayed with an insecticide at a cost of $3 per tree, plus a fixed overhead cost for equipment rental of $50. Letting C denote the total spraying cost for a randomly selected acre, find the expected value and standard deviation for C.

Within what interval would you expect C to lie with probability at least 0.75?